ABB XSeries G4 6200 User Manual page 165

To A/D Converter
Onboard 250Ω
resistor selected
using three-pin
To A/D Converter
Again, the 4-20 mA transmitter that was selected by the user must be fully
operational at voltages as low as VCC – 5 VDC. Again, VCC is the source voltage
available at the user's site, and 5 VDC represents the voltage dropped across the
meter's 250 OHM resistor at the maximum loop current (20 mA).
Totalflow can provide a 12 to 24 VDC converter. This converter can be powered
from the meter's VBAT (either comm ports or J16). The converter's 24 VDC output
can then be used to power the 4-20 mA transmitter loop. In other words, VCC
would now be 24 VDC. Subtracting the 5-volts dropped across the 250 OHM
resister would leave 19 VDC to power the transmitter.
2104349 rev. AD
Flowmeter
To A/D Converter
A
Flowmeter
1
3
250Ω
jumper
To PCCU Control Flowmeter
250Ω
External to
flowmeter
2-wire (line powered)
AI +
4-20ma transmitter
User supplies 250Ω
resistor and wires it
250Ω
across the AI input
AI -
External to
flowmeter
2-wire (line powered)
AI +
4-20ma transmitter
B
AI -
External to
flowmeter
AI +
3-wire 4-20ma transmitter
Onboard 250Ω resistor is
selected in PCCU setup
AI -
C
VCC
pins
VCC
VCC
Page 35